System and method of secondary cell group (scg) activation

Abstract

The disclosure provides a method performed by a UE in a wireless communication system supporting a dual connectivity. The method includes identifying that a secondary cell group (SCG) is deactivated, receiving first information on a transmission configuration information (TCI) state for a primary secondary cell (PSCell), and receiving second information for activating the SCG, wherein the TCI state is activated for a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) on the PSCell of the SCG activated based on the second information.

1 . A method performed by a user equipment (UE) in a wireless communication system supporting a dual connectivity, the method comprising:
 identifying that a secondary cell group (SCG) is deactivated;   receiving first information on a transmission configuration information (TCI) state for a primary secondary cell (PSCell); and   receiving second information for activating the SCG,   wherein the TCI state is activated for a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) on the PSCell of the SCG activated based on the second information.   
     
     
         2 . The method of  claim 1 , further comprising:
 measuring a reference signal received power (RSRP) based on a reference signal on the PSCell, upon activation of the SCG; and   performing a random access procedure for the PSCell based on comparing the RSRP with a threshold.   
     
     
         3 . The method of  claim 1 , further comprising:
 while the SCG is deactivated, performing radio resource management (RRM) measurements for the PSCell; and   transmitting, to a master node, a report of the RRM measurements.   
     
     
         4 . The method of  claim 1 ,
 wherein the second information further includes information on a downlink bandwidth part (BWP) to be activated for the PSCell upon activation of the SCG.   
     
     
         5 . The method of  claim 4 ,
 wherein the second information for activating the SCG is received via a radio resource control (RRC) signaling or a medium access control-control element (MAC-CE) signaling.   
     
     
         6 . A method performed by a master node in a wireless communication system supporting a dual connectivity, the method comprising:
 identifying that a secondary cell group (SCG) is deactivated;   transmitting, to a user equipment (UE), first information on a transmission configuration information (TCI) state for a primary secondary cell (PSCell); and   transmitting, to the UE, second information for activating the SCG,   wherein the TCI state is activated for a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) on the PSCell of the SCG activated based on the second information.   
     
     
         7 . The method of  claim 6 , further comprising:
 receiving, from the UE, a report of radio resource management (RRM) measurements for the PSCell, while the SCG is deactivated.   
     
     
         8 . The method of  claim 6 ,
 wherein the second information further includes information on a downlink bandwidth part (BWP) to be activated for the PSCell upon activation of the SCG, and   wherein the second information for activating the SCG is received via a radio resource control (RRC) signaling or a medium access control-control element (MAC-CE) signaling.   
     
     
         9 . A method performed by a secondary node in a wireless communication system supporting a dual connectivity, the method comprising:
 identifying that a secondary cell group (SCG) is deactivated;   transmitting, to a master node, first information on a transmission configuration information (TCI) state for a primary secondary cell (PSCell);   transmitting, to the master node, second information for activating the SCG,   wherein the TCI state is activated for a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) on the PSCell of the SCG activated based on the second information.   
     
     
         10 . The method of  claim 9 , further comprising:
 receiving, from a user equipment (UE), a random access preamble on the PSCell upon activation of the SCG,   wherein the random access preamble is received in case that a reference signal received power (RSRP) measured based on a reference signal on the PSCell is equal to or less than a threshold.   
     
     
         11 . The method of  claim 9 , further comprising:
 receiving, from the master node, a report of the radio resource management (RRM) measurements for the PSCell, the RRM measurement performed by a user equipment (UE) while the SCG is deactivated,   wherein the second information further includes information on a downlink bandwidth part (BWP) to be activated for the PSCell upon activation of the SCG.   
     
     
         12 . A user equipment (UE) in a wireless communication system supporting
 a dual connectivity, the UE comprising:   a transceiver; and   a processor coupled with the transceiver and configured to:
 identify that a secondary cell group (SCG) is deactivated, 
 receive first information on a transmission configuration information (TCI) state for a primary secondary cell (PSCell), and 
 receive second information for activating the SCG, 
   wherein the TCI state is activated for a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) on the PSCell of the SCG activated based on the second information.   
     
     
         13 . The UE of  claim 12 , wherein the processor is further configured to:
 measure a reference signal received power (RSRP) based on a reference signal on the PSCell, upon activation of the SCG, and   perform a random access procedure for the PSCell based on comparing the RSRP with a threshold.   
     
     
         14 . The UE of  claim 12 , wherein the processor is further configured to:
 while the SCG is deactivated, perform radio resource management (RRM) measurements for the PSCell, and   transmit, to a master node, a report of the RRM measurements.   
     
     
         15 . The UE of  claim 12 ,
 wherein the second information further includes information on a downlink bandwidth part (BWP) to be activated for the PSCell upon activation of the SCG.